added feature with unimplemented steps: create card with topics
added failing step: create card with topics
added mongoid-tags-arent-hard to the bundle
card: added taggable_with :topics incl. text field
added failing step: I set the topic to xxx
defining form elements to set the chosen topic
setting the form for choose_topic
added controller context
session: store chosen topics
added failing spec: ask card with topic
implemented: ask card with topic
CardsController: added topics to the permitted parameters
calling the right method to show a random card
check, whether topics are set: moved logic: controller => model
moved and renamed scenario: new => ask_random_card
added green spec: card also has other topics
added failing spec: chooses only cards which match all topics
implemented: chooses only cards which match all topics
formatting the box to change the context topics
correct width of container and content